Challenges of higher speed wireless access

Previous proposals for next generation wireless communication technology have prompted numerous research efforts comparing different technologies for next generation systems. Variations of wide-band CDMA and TD-CDMA have been the strongest candidates for the physical layer. Third generation technology promises data rates of up to 2 Mbps in small coverage areas for low mobility users, whereas, for some applications higher data rate in larger area is very desirable. That brings about another challenge as to flexibility of third generation proposals to accommodate new services such as higher speed packet data, particularly in downlink, for wireless Internet access. We discuss technical challenges and requirements of these proposals and briefly study complexity of network and terminals for multi-mode, multi-band systems. Moreover, we propose the concept of integrating asymmetric high-speed wireless packet services with current proposed systems for third generation wireless services